my laptop runs windows 7 ultimate x64.i have two partitions- C & D drive. i had locked it using bitlocker.. later i decided to install windows 8 and to not take a risk, removed the bitlocker protection..bitlocker was decompressing when due to a hardware problem my laptop shutdown. i gave it to some guy who formatted it. the trouble started when on booting up, the D drive has started showing 0GB used..i seem to have lost all the files and the drive doesnt seem accessible.. the new OS is windows basic. what do i do?? have i lost all my files??